Process of reclaiming used lubricating-oils



.UNITED' STATES PATENT OFFICE.

WALTER L. JORDAN, OF GLENDALE, CALTFORNIA, ASSLlGNOR 'IO OELITE PRODUCTS GOMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA.

, PROCESS OF REGLAIMING USED LUBRIOATING-OILS.

No Drawing.

To all whom it may concern Be it known that I, WALTER L. JORDAN, a citizen of the United States, residing at Glendale, in the county of-Los Angeles and State of California, have invented a new and useful Process of Reclaiming Used Lubricating-Oils, of which the following is a specification.

This invention relates to a process for treating used lubricating oils to render them fit for reuse in lubrication. Lubricating 011 which has been used for lubricating machinery, and particularly Where it has been subjected to high temperature and severe wearing conditions, as for example in internal combustion engines, such as Diesel engines, becomes so fouled with sus ended particles of carbon and metal, large y 1n :1 colloidal condition, that it is unfit for reuse, and is diflicult'to purify, the suspended impuritiesbeing hard to remove on account out, so as to carr of their colloidal condition and of the viscosity of the oiL' The usual method. of reclaiming such used oils has been by adding coagulants, and allowingthe same to settle down more or less of the carbon and metal ic. impurities. Or, in some cases, afte adding the coagulants, and allowing sufiicient time for coagulation to take place, the oil has been passed through a gravity type of filter. Both of these methods the original oil and at comparatively small are unsatisfactory by reason of the time required. for the operation thereof, and b reason of the imperfect clearing of the 011 effected thereby. g

The main object of the present invention is to rovide for reclaiming or recovering the oi from usedor Waste oil by a rapid and effective operation, in such manner as to produce a reclaimed oil which is as clear as expfnse.

y invention consists essentially in adding a suitable amount of kieselguhr (diatomaceous or infusorial earth) to the used oil, heatin and agitating thorou hly so as to at uni orm suspension of the ieselguhr in t coil, and passing the mixture through a pressure filter under proper conditions of heat and pressure to provide for rapid and clean filtration.

Specification of Letters Patent.

Patented Oct. 11, 1921.

Application filed November 21, 1916. Serial No. 132,621.

The amount of kieselguhr used will depend on the kind of oil and the amount of of heat used and the time of heating and agitating will be determined in each case by test. The kieselguhr used may be ordinary air dried kieselguhr, reduced to a fine state of'division, sa 100 mesh and finer.

The very iirst portion of oil passing through and issuing from the filter press will be turbid, but as soon as a small quantity of oil has passed through the filter, a thin film of kieselguhr will have been built up on the cloth or other supporting medium of the filter. As soon as such a film'has been built up, the oil coming from the filter will be perfectly clear and bright. Hi h pressure may be used to give rapid ltration Without injuring the uality of the filtrate.-

by the above described process and converted into clean transparent oils in which it is impossible to detect any haze .or cloudiness by the naked eye.

What I claim is:

1. The process of reclaiming used lubricating oils which consists in mixing finely divided kieselguhr therewith and subjecting the mixture to filtration under pressure.

2. The process of reclaiming used lubrieating oils which consists in mixing finely divided kieselguhr therewith, heating and agitating and then filtering the mixture under ressure.

3. Tlib process of reclaiming used lubricating oils which consists in mixing finely divided kiesel hr therewith, heating the mixture and ltering the heated mlxture under pressure. a

In testimony whereof I have hereunto set my hand, at Los Angeles, California, this 13th day of November, 1916.

WALTER L. JORDAN, 

